You're able to opt out of My Location (beta) in the following ways:
Android-powered devices:
You must
disable My Location for your device completely in order to opt out for
Maps. From your Home screen, go to 'Menu' > 'Settings' >
'Security & location' and un-check 'Use wireless
networks.'
BlackBerry, Symbian S60, Windows Mobile, Sony Ericsson,
and many other devices:
Select 'Menu' > 'Help' > 'My Location
(beta)' and then choose the option to "Disable My Location".
iPhone or iPod touch devices:
You may choose to not 'Allow'
location access the first time you use an app or may disable Location
Services on your phone entirely. Turn off Location Services by going
from your Home screen to 'Settings' > 'General' and turning "Location Services" to 'Off.'
Palm WebOS devices:
Go from the Launcher to 'Location services' and turn "Auto Locate" off.
Once you opt out of My Location, Maps will not continue to send radio information back to Google servers to determine your handset's approximate location.
